We had access to lots of donor bike parts from a local alternative transportation group. Follow the link below to see how you can get similar parts.
This Ible describes the prototype for the cargo trike that followed. I am working on an Ible describing the next version of the cargo trike we have built. I will add a link to that Ible when I get it published.
Prototype Cargo Trike Specifications:
Overall weight 75#
Cargo portion with front wheels 48#
Rear portion with rear wheel 27#
Cargo Bed 30" X 48"
Pivot Pin 24" from front
Front wheel axles 27" from front
Handlebar is 30" above the bed